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In September 2018, security researcher Patrick Wardle found that Adware Doctor, the top-selling paid utilities app in the US Mac App Store, was exfiltrating the browser history of anyone who downloaded it and sending it to a developer. Adware Doctor is intended to protect browsers against adware. A month after Wardle notified Apple, the app remained in the store; it and the same developer's AdBlock Master were removed shortly after TechCrunch published his findings.